Unfortunatley it means you have trouble with your air suspension. Fairly common on these vehicles and not a cheap fix either. I would have a shop check it out. Have you had any tire or brake work done recently because if so, someone could have knocked a wire lose from one of the shock sensors. Just a thought.

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It means there is a fault with the airbag system and with the air ride system. You will need a higher end scan tool to get the fault codes. Once you have the codes you can then start researching possible solutions for those problems.

Seems like a common problem with these trucks. I thought I was the only one. I just posted this comment for someone who has a 2003.....I'm not an expert and not sure how widespread the warning message can be, but in my personal case:
I have a 2001 Yukon Denali.....I have the same problem and have for many months. I took it in a few times and the GMC Dealership finally told me that It's the ride air bags. In my case they are leaking. Its not the same safety airbags in the front dash to prevent injury...but these models have air bags under the truck that automatically adjust to level when weight shift...you might hear the occasional sound coming from the back while driving or when more people are in your Denali. To me it sounds like a power tool. The Service tech told me it's not harful nor will it damage anything, but it costs about $2000 to fix, because they have to replace the whole thing. He said you may notice the sound coming on from the airbags more often because of this..because the system is working harder to adjust the weight due to the leak/loss in air. So occasionally for about a year...the light comes on....but it has done nothing else.

Is hydrloic system working when you start your car usually the hydraulic system works around 5 minute the ride control it?s the rear chock absorbers so, if it's not working check the(RTD fuse)in fuses box in the engine area under the hood

if your engine starts up and dies right away the you probably have a fuel pump problem and the service ride control mean that your air ride compressor has gone bad just turn your key to the on position and wait about 30 seconds you will here buzzing from the left rear wheel area if the compressor is working